Bicycle brake



R. MlLLRAY BICYCLE BRAKE Sept 6, 1949.

Filed Dec. 19, 1947 2 Shee'ts-Sheet l M0. .4 B l. g 4 2 H w/,m /4 z ,3 6 5 4 2 2 3 w 2 2 w a v a \v 8 W 2 a M C C I II ventor R. MILLRAY BICYCLE BRAKE Sept. 6, 1949..

2 Sheets-Sheet 2 Filed Dec. 19, 1947 Robert Mil/rag" INVE TOR Fig. 3 BY adymqfiM Patented Sept. 6, 1949 UNITED STATES PATENT OFFICE BICYCLE BRAKE Rnbert :Millnay, :SantaiMonica, Calif.

Application December 19, 1943?,Se1ial'N0. 792,693

(01. IB'Z -G) 2 Claims. 1

The present invention relates'to new and-useful improvements in brakes and more particularly to brakes for bicycles.

An important-object of the invention is to provide a heavy duty brake for use with bicycles equipped with motors and which still retain the use of theregular bicycle pedals.

A further object of the invention is to provide a bicycle brake including a brake drum secured to the hub of the wheel and with which brake bands are movable to provide a braking action by a reverse movement of the pedals of the bicycle.

A still further object is to provide a device of this character of simple and practical construction, which is efficient and reliable in operation, relatively inexpensive .to manufacture and install in .operative position and which otherwise is well-adapted for the "purposes for which the same is intended.

Other objects and advantages reside :in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a longitudinal sectional view of the hub of the drive wheel of a vehicle and showing the brake mechanism provided for the wheel in accordance with the present invention;

Figure 2 is a vertical sectional view through the brake taken substantially on the line 2--2 of Figure 1;

Figure 3 is a group side elevational view of the clutch and brake elements;

Figure 4 is a fragmentary sectional view of the brake taken substantially on the line 4-4 of Figure 2; and

Figure 5 is a perspective view of the key for the sliding clutch and brake actuating collar.

Referring now to the drawings in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention, the numeral 5 designates an axle suitably secured to the frame of a bicycle and on one end of which a sprocket support 6 is journaled by means of a ball-bearing assembly I.

The outer end of the sprocket support 6 is threaded as shown at 8 and on which a sprocket 9 is threadedly engaged and secured in position thereon by a nut I0 threaded on the reduced outer end portion ll of the sprocket support. The inner end of the sprocket support 6 is formed with a feed screw 12 engaging an internally screw 2 threaded clutch and brake collar mounted on the axle 5.

One endof the collar I3 is provided with-clutch teeth l t engageable 'with'similar clutch teeth [5 at theinnersurface of a clutch ring it provided at "its ou'ter end with-a flange ll secured to the flange l8 a't'o'neendof a Wheel hub 19. A ballbearing assembly '2'?) -is positioned between the sprocket support 6 and clutch ring it to rotatably support'oneend of thehub menthosprocket support.

The opposite end of thecollar 43 is also provided with clutch teeth '21 engageable with similar clutchteeth 22 at the inner end of a brake operating-cam 23 rotatably supported on the axle. Thecam 23 includes an annular flange 24 rotatably supporting the other =endo'f the wheel hub F9 with=a ball bearing assembly 25 therebetween. The adjacent'endof the hub I9 is provided with a flange- Z6 to which a brake drum 2'? is secured, the spokes 2 8at one side of the wheel being secured to the 'outer edgeof-the brake band and the spokes 29 at the other side of the wheel being secured to the flange I8 at the opposite end o hub [9.

The outer side of the brake drum 21 is closed by a cover plate 29 which is suitably secured in a stationary position to a part of the frame of the bicycle.

A pair of brake shoes 30 are positioned in the brake drum 21 with brake linings 3| on the outer surface of the shoes, one end of the shoes being rockable on a pin 32 carried by the inner face of cover plate 29. Springs 33 connect the brake shoes to each other to hold the brake linings out of engagement with the brake drum 21.

Rollers 34 are journaled at the free end of the brake shoes 30 to travel in grooves 35 at the opposite sides of a spear head 36 working between the rollers and formed at the outer end of a plunger 31 slidable in a guide 38 on the inner face of cover plate 29.

The inner end of plunger 31 is provided with a flat head 39 engaged by the outer end of cam 23.

The collar I3 is held against rotation on axle 5 by means of a key 4|] slidably-received in a slot 4| at one end of the collar and formed with a resilient clip 42 frictionally held against rotation in a reduced portion or groove 43 in the axle, the groove holding the key against sliding movement on the axle.

In the operation of the device, the sprocket 9 is connected to the usual bicycle pedals and upon rotation of the sprocket in a forward driving direction the screw 12 will move the collar l3 on l 3 slidably 3 the axle toward the clutch ring 16 to engage the teeth of the collar with the ring and thus connect the wheel to the sprocket in driving engagement.

A reverse rotation of sprocket 9 slides collar I 3 in a reverse direction to release collar [3 from ring l6 and engage collar 13 with the teeth 22 of cam 23 to thus rotate the cam in a manner to apply brake shoes 30.

The frictional engagement of clip 42 with axle 5 will hold the key 40 and collar I3 against rotation on axle 5 when the collar is disengaged from either clutch ring IE or cam 23, but will permit rotation of the collar when engaged with either the clutch ring or cam.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. In a bicycle brake and clutch, a wheel hub, a clutch ring secured to one end of the hub, a brake drum secured to the other end of the hub, a sprocket support rotatably supporting the firstnamed end of the hub and a cam rotatably supporting the second-named end of the hub, a collar movable longitudinally in the hub for alternate operating engagement with the clutch ring and cam, a pair of brake shoes in the drum, a plunger slidably carried by the drum and actuated by the cam, a spear-shaped head on the plunger engaging the brake shoes to apply the brake, and means operatively connecting the sprocket support to the collar for opposite sliding movement of the collar, said means comprising a screw feed between the sprocket mounting and the collar.

2. In a brake mechanism for bicycles including an axle, a brake drum carried by said axle at one end, a pivot pin fixed in said drum, a pair of brake shoes mounted in said drum and having first and second end portions, resilient means connecting and urging said brake shoes toward each other, means carried by the first end portions of said brake shoes embracing said pivot pin for rocking movement of the brake shoes about said pivot pin as a fulcrum, anti-friction means carried by the second end portions of said brake shoes, a slidable operating member carried by said drum and having a spear-shaped end portion slidably contacting the anti-friction means to urge the brake shoes from each other against action of said resilient means, and a cam journaled on the axle and having a flat surface, said slidable operating member having a fiat head abutting the flat surface of said cam.

ROBERT MILLRAY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 709,479 Glouer Sept. 23, 1902 989,617 Lester Apr. 18, 19 1 1,158,751 Van Deren Nov. 2, 1915 1,872,796 Norton Aug. 23, 1932 2,091,586 Glacy Aug. 31, 1937 FOREIGN PATENTS Number Country Date 20,597 Great Britain Sept. 24, 1904 376,640 Great Britain July 14, 1932 

